Most likely the HID transformer is not producing the correct voltage to properly charge the HID bulb. 12 volts goes into the transformer, but a lot more comes out. The HID needs a lot of volts to run, hence the need for the abovementioned transformer. But, the transformers are REALLY expensive.

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If the vehicle is equipped with HID lighting, you could have a ballast problem to the light. If they are regular type headlights the connector to the bulb could be causing a problem with a ground or power supply

if you did it yourself and did not use factory lights or ballast then it could be a voltage detection problem. If you did use factory parts then the headlight switch may have failed by coincidence. also check connections at HL plugs and or switch. ???????????

Tips on How to wire up:
1. HID bulb's amp wires connects with the ballast's amp wires. (There's only one way to connect them.)
2. The positive and the negative spade connectors from the hid relay connect with your vehicle's low beam connector, closest to your battery: the driver side. The passenger side low beam connector is not used and should be insulated. You can use electric tape.)
3. Each ballast is connected to one of the relay's clip connector, and it's grounded on each side to your vehicle's body. (One connector for each ballast, one for each side. You can use the screw for the body as a ground.)
4. The red wire(with the inline fuse) in the relay connects to your battery's positive terminal.
5. The capacitor sits on the relay switch. (Google for how to wire the capacitor onto the hid relay switch.) dynoxg image
6. The halogen bulb sits on an adapter. You can safely remove them from each other, and use an H7 hid adapter instead.

this sounds like a bad head light switch, you have replaced the bulbs and all fuses are good then i would say try the headlight switch. there is testing you can do to make sure thats the problem but you will need a test light and also a assume the highbeams work. this is a common problem when the headlights start to flicker its due to a switch most times, if was just one light then i would say to check the wiring to light but as its both then i would start with a new or used headlight switch.good day

Removal & InstallationTo Remove:WARNINGThe halogen fog light bulb contains gas under pressure. The bulb may shatter if the glass envelope is scratched or if the bulb is dropped. Handle the bulb only by its base. Avoid touching the glass envelope. NOTE: The headlight bulb should not be removed from the headlight assembly until just before a replacement bulb is installed. Removing the bulb for an extended period of time may affect headlight bulb performance. Contaminants may enter the headlight assembly where they can settle on the lens and reflector. Never turn on the headlights with the bulb removed.

Before servicing the vehicle, refer to the precautions in the beginning of this section.
NOTE: Make sure that the headlight switch and the ignition switch are in the OFF position.

Remove the pin-type retainers, screws and the air deflector from the radiator.

Remove the three bolts and the headlight assembly.

Disconnect the electrical connector.

Remove the cover from the rear of the headlight assembly.

If equipped with HID, release the spring tabs to remove the low beam bulb, otherwise disconnect the electrical connector and remove the bulb.

I have a 2005 Lexus Rx330 with HID AFS headlight. My passenger side light went out. I thought the bulb burnt out, so I bought a new bulb. After replacing the new bulb, it happened exactly like my old bulb. It light up lightly and then total black out. What's wrong with it? I thought the ballast burnt. I called Lexus dealer and asked for the new ballast/transformer. Surprised me, they don't know what is it. They told me they only know the wiring harness and the socket, but not the ballast ??????? Could you tell me what do I need to replace?

WARNING: A transient high tension (25,000 V) occurs at the bulb sockets of the high intensity discharge (HID) lamps when the combination light switch is turned ON. It may cause serious electrical shock or electrocution if you do not observe the cautions below .

CAUTION:

Never turn on the combination light switch before fitting the HID bulbs to their bulb sockets and completing the reassembly of the headlight assembly.

Do not service the headlights assembly in wet conditions, such as rain or snow, near a sprinkler system, or when your hands are wet to prevent electrocution.

Do not touch the surface of the HID bulbs with your bare hands and do not stain it with any oils and fats.

Do not disassemble the inverter unit and the ignitor unit.

Do not turn on the HID bulb by using a power source other than the battery mounted on your vehicle.

Make sure you have the anti-theft code for the radio and the navigation system, then write down the frequencies for the radio's preset buttons.

Combination light switch OFF.

Disconnect the battery negative cable, then disconnect the positive cable.

Disconnect the headlight assembly 2P connector.

Remove the Torx bolt (A) using a Torx T20 bit.

Turn the cover (B) 45 ° counterclockwise to remove it from the headlight assembly.Turn the socket (A) 45 ° counterclockwise to remove it from the bulb (B).

Pull the retaining spring (A) away from the bulb (B), then remove the bulb (B).

Install the new bulb in the reverse order of removal.

After reconnecting the battery, enter the anti-theft code for the radio and the navigation system, then enter the customer's radio station presets.